Option to use volume keys to control media volume anytime [1/2]

The volume keys control the Media volume rather than the Ringer
hence removing the issue of accidentaly changing the Ringer volume.

Credits: Pawitp

Change-Id: I789e05bdb0bb7c968f71e4e10f4a759b3dbd0b59

Conflicts:
	core/java/android/provider/Settings.java
PackageManager: allow build-time disabling of components

Allow components to be specified as disabled at build time
(applied on boot).

This allows stock OTA components to be marked as disabled in
CM builds.

Change-Id: I6e4499cc40a779792a5ea97a10137399dad7d69f

Conflicts:
	core/res/res/values/symbols.xml